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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea71545b768ac5451256f0177b0933e3c27c0a441f1d52ee8ef456ecd1502aa' 
  AND token = 'XJo32MZz+X3ZceKKKKxwkuKHhQkf3RVY/hszVdHVrXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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