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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36ea9e883fe03224697259a9175ed1ccc2e5900af2355b467fa2576074fa5c9c' 
  AND token = 'Klgzeo1rTEVrJM0OGG43f9GRefYklaJcKWsoofN9794=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00084

JSON explain

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