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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc1838baac90f2bae16f010583242db2221d484a8588692a1f8a3b1c345fb2d7' 
  AND token = 'P5Nc4Z7qUgTFNgCobD1SrtekO4fHMROFljRzDwJ+4AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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