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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1907a24c19d47395e47309adaf72eb9af59f3fa39322466fa39e43319bd327e3' 
  AND token = '80DHbP8uy3ScxFfsb07mnVrlVA7j4bGFJRC8u45tLb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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