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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b24a05dd24d4cf3f23e5a5738c8a57b1055087faca33f31bb62a240daa6016' 
  AND token = 'zN6xKhuAZQQJTfXDXniUb9QCFJi5GjA3OeHEQM6RuF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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