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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77488b4afddfbe38af8d13bcf248f9a26e008418b5ff4485db30f2c98b053cae' 
  AND token = 'VF7arH+zRJdrhIwr1dbORZh6a2/2WiOJr5melEU3YWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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