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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54ad318852006566fc5242b3f9b872314352007ece4763593d2eb9e3952b788e' 
  AND token = '7mYOdMLJPDMtDWPZCQFYFbhCSJMPFFXn94LjgFXReuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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