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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96566f59f66a3750e34dd5c346ada9298a2b6eabd35515168ad68b3e3d860f39' 
  AND token = 'qmRxE0B8jYfk+EadIg73Ny+MqqgYkKUI4d6N3lpwVV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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