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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebede2a5f9f4bd39d66ea362ff228212fdd56ded78df7f116e07dabfda83eb3e' 
  AND token = '0Vt723YZj+DqcENNlRYPd6UJlHLcxOo/QrndVn3YPH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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