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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0675424990dc7c7f2b1bd0634b083495f84ea0933f081b7e6532377e46a002cc' 
  AND token = 'fK6uayvGSbO6FuDjiwUOU1eIx/VxJrhasFQdZyU2iqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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