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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfff502cb866df4158766ad2ed13fa3c1ffe02ed492e7b67e0aad8874e8ba83e' 
  AND token = 'wv/rSges8moKp12xIcUFrd1ih8gYKwWNeQGyHklsDps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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