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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9827284dfc9684a757729dd3d9b80a764666b83482c9f519e6afde7986de26e' 
  AND token = 'g37395b528pIqE5gc1LX3txidFHSSZLDLfcmAeIB9Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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