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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938b86a6fd230698db62920c4bd4ed3d6774110fc3c098f82bf9054c73b9b17b' 
  AND token = 'AsIqfCx8NLJo2ttMlIoMwfrHoLmVZNd19KzJ95fDcbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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