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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1332568b8ee8baa7d0d5bc9220d64b2fa87da09457ee391eb7c59acf1410d6b7' 
  AND token = 'EmU4J8Cw2e/keH4glH1AlLbpU0WVFVOT+PnXQgsi+5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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