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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363cf29dbd9c9e5486f3650aaa02a8810521f6ab5d706ca612e9f72c0342d21e' 
  AND token = '0/9wBMbR9QdhPJabMc28yKm1Y75s6rtkkQqp7ocIoXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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