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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80105a854601de0a98525ae8611a1de98e113cc204634768ba73037437ffc9c8' 
  AND token = '0MY6NZzlxAmB4VQ76oIgC1/QIAdsQanm0pC9n1hyjo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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