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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35f9bc7d880aa7186f66f03a339a3403d9c9267de2476d40c17dfdef7a64b9d3' 
  AND token = 'Klx1N+l2oD4dSr39rRrl2O6OAQ7TLUu94gbVv/yT/FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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