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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f963186c44af65d6dd3c0cffa471526df672154d131fccc2b00dcff8fb78968' 
  AND token = 'J1MJKWyFeaTrKhz/YaWUfwDq5ppzu+CJJzUFwx12I+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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