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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60813318263bfa930933f1658c00dcf583f7245c6f486a9ec6abacef9b6a7f7c' 
  AND token = 'R85o6I8cEBrLxx7/b7FjVUJfstUOEj6qBCULkQvtNaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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