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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9361a85d22ea4cbb9eab90d94d1f72e80bda7684ccf3990b6502bfeb1c8ebf47' 
  AND token = 'lNYodQklI8Nn8FuIiXpUupish+mUEirzAfaeTkkfDXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00585

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}