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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6409931221b4c56a34acd1a47e30b2921e5be560c3593f7da9d116050bb5319' 
  AND token = 'W794+0gd2iI937TbGiVDeL7WE/3KrXXLV5lEqbRsZh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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