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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd198428b8fd9186e01f6085e31991037596114a59d203262f3e0342795104b' 
  AND token = 'SN1/3G1CAXzt55UY4nMLuLku/8sH7pxnX7/PubJssf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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