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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f37b5c56a04ea5f18144b55a52fc8a1086a8ccdbc2f212ee8ef4c6b7ebdafca1' 
  AND token = 'ZedaKswgqjVP9p2FCH4EJoUIV+Qi3wEIr7NgspdzoO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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