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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6739b557783efe043cf67bb8fe2b541705d4374559db1a2529ece5320a893d6c' 
  AND token = 'ZpiwqKGMr40ALY54rw4V3R1GTc9lfW5KjTpQxzK5Xxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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