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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0c5673b69930023886b556fc0a3c6d91f6cef1e1735601c2fd5889d2f44390' 
  AND token = 'gyGg3FRozT9uHnrcI7RTBf+dgiN+dawMMztlOOfcN8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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