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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '200df37b416a7d76110ea93b8e35a6eff3cff601c59cceba21619fd76ae76589' 
  AND token = 'rOH7v/9IUWcMYBr4Wfthp9Q8mZ3mhUBA/8wBQatv2mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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