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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20f91e135e7b76f45e7f51d7d65fab243a788eb4a3689feaa5a8e50be0f9528' 
  AND token = 'crWmyHPt51Jqt2o8YSLy/n6rRkt3eQmlAEoapSQDdFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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