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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b125f8890f867d0d555591cc3418f5c3bed9567f51faeb20bf30653b04c3c4' 
  AND token = 'NFlLRl5jwrdo6te8kLsmRVoRGJh04MHLnfBzmQ9xvUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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