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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78ef08f9a513a83cf2205404d9f7045028f36bc06de9d2ea436d55968e5ce7bf' 
  AND token = 'moUm82Kzl64AvbeafEx1o0R1zMQg5gtZhUEy/u5lO/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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