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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0adbb769a11bc7cd9896b5bc8d2d7acd6840044ba38c5b8202541300f289ccbd' 
  AND token = 'jjpcSDb8Fjoil7yPzL+4UGvOlfaTc556kWr6OHD2lQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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