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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2989b3fd731b6cd6f083d1c8f6486edc654e2111ea6e7d3067cd17725b167f7e' 
  AND token = '5d9QFCZCuyHPd3jE2oyLJbzoFo3MeG6wAbOn8NP+uC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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