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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08ad41212b7d715c92e456a7991aa53a862b38a8c18bec85cecce3e3b8291762' 
  AND token = '8OrSSmu7rYqlP2ea/D8Gc/4EuUfdoEM+qOZtAyJ7XgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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