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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a3d4f41b1f0a42709bca8b98ff48b1929810414cbf030d41b5b2af2f145ed9' 
  AND token = 'XYEfSfG9JhRH3s0lx+Q3qN6EJD7NTe+X9xVBYUkcEFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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