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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd59486cca5568f43e0fb1bd7f8e7b2a81de7e6aad8385febf7b3b5789fb5d37' 
  AND token = 'l2jGgflsAjHoIGSyotjHM6rd4ZUJOkBSvaLBdPc8fQs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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