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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0109cd1942590f67d7a6d399ebe7d4f0fb99ac6ba48432f5f20bd8500f533d71' 
  AND token = 'MEYc6Opv58Z79XvfvE2dc44NwVyQ9Z7xM7F3KFsgz/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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