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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51aff785dd698484d4eac116267fc63239097ca7a3b8d7cbd315139a31e26102' 
  AND token = 'FRl082x43s1/8rqHsdeijnsVvE2KsuAMRuyus32BB8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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