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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f405ab6b3dbded0e9a62b2d1b9e9eb7881958f9ccb5ed362036afcb9363c9d4' 
  AND token = 'jGd12qvmlynhV2eQY/8ec5IfJaJ4QKBlrj16zPlyW10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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