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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316129834d649bb09ad79ed56c074d59802ca0c45c65d2f3ed0a1f4479a6b328' 
  AND token = '4ZLogJ399MjfNrgJlCN3adk2DpBDCukjmKFzytyuyWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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