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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccb83a516aab51f71465e44d48c5ba15e9a80bb9023df502e7415a0e391fdf9a' 
  AND token = '+Osf2U/14Xk8Vh8AYW9ZHx7Um9kUCvAk2TqsnSdawWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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