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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615892eea3aa3e40903b5152eac808014abf3e71495b4ca1408764f08ac18e82' 
  AND token = '8zqQCaq0y3HrXu88J3YgGV9vWowcMrKqMrughITnT3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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