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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f0289cb2e3ccbd79789ddb5b0f01561ab439b93f979e4b6faa2255c6fea7eea' 
  AND token = '24eJgaKcQzho0JUB/pK/t2wCwITo3A1CwWLjfiD4GEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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