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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8410a30f1522d7dfb3b47558828424ba2d7b20ff0d968101c2e7980b3e476d0' 
  AND token = 'He5Mu6lCrlV9CzKU44QHGJpOgl/WeD1sDD2RdzEHu/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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