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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a610721f32a935ef97d8963c751f93a5b397b50d3c272f7c2d23ea0f9cb7b5b' 
  AND token = 'finuEev45I2+jvSO+MNDcGr8rbj53SzB3NXU88RQEA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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