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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e481204ae7f4f943377d755e0d94fbc5cd0f57ef359c8d5583c7a6091276a60' 
  AND token = 'DS25FUWd1Hzz25nnWeWQKxEloBhreRqhhwuo2cgTrbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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