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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93bad3addc9d38b12b9ad53da44991d23bb5f6e7b13777d1bf76b6b991a324c6' 
  AND token = '9G3ajyipO+RiViS4A60/t0IfjJ9cH6xkYvIUWXfrjG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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