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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc82ee9e315d6d999cbe648302ab43610b8074653d457207cec92d7b15ec403' 
  AND token = 'R7yXNRQBfPAxcvABrMd61o74MI+nbco+mXEv9Fu5scs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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