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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6489aad4f65a9e2ed5ce71a3573e3c3154ffb2d1b23796dd8227c1373a2dac4' 
  AND token = 'gX200lroGFh9nvkl4PT73XQyZpelX7BqgGvSsAwS7JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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