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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b7b3b980514af7a547e502c6f5e1779b4450a57d1acd22cc18205e8eaeda10' 
  AND token = '6MAgz//6nNpdVIqG+lzkCC6R6iCob7klMhQUq1PZuLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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