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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8109111faa12b30f8bb61ef84c69dc677c9c1b9c526e7026af4cff6d1c608126' 
  AND token = '8KievD5Zd1Rxl/VLpPGtHBen4HCvyL6l7joDG43GbWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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