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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eee76a0e8050bee1e0950bb0dfccdc97a128a16ec3eed1909ecca15a87842c17' 
  AND token = 'um7J6GwBnnXmQKa0BFF4k2DW0V6UA/46wJf47RN1Wng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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