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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0919d781f8a02712c94330e24506e0be442f0e0f7f654c3eef76525938c90023' 
  AND token = '7PZA7Fml8x55czx09Y/ejmLEsOsU84bBuhBR8cBKUXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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