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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b61f48fdea2702ba34e165150d4c42f3d4339193c0a9fa5c7fb4917b46e169' 
  AND token = 'e6myvwBlmBg16EusPO7DGhbA8jbMWmxFdvJx5P/wfR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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