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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832a21d971c237c760d40c4657b264eba8560624f825562bfa0d811f08ef5d90' 
  AND token = 'NM7HGHnxW50xoKnfCNpttOvLr03KPq8EUeZuSp4aYdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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