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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b40870fbf78aa99d65dbefab95a8e19244d6a9c820666af8d4ab6f9e47ba6b' 
  AND token = '1RpAH5eK+fitrAl4NAf0pk3lFmTozBA9carGJ67/Ddo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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