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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9079fc9489e5db63e08c67d2cd62dd7ac6e9f6f4dd3ace866676333e1e5ba2' 
  AND token = 'RuLCQ1ILoULW3VoaYCYoWGgBbKB6mwNTh4Rlime1BmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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