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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '618b4daeafa48bfb3cfa68cec58d14e255ab8f9cda9c05b3b841a7d151607552' 
  AND token = 'eoCR7vqee0sXKyCQZ7PcLGNJuB262ugmc+OCGwjdB90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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