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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601b9dad40922f5e01c9a47c2763421178f9a8b34be39a2c275ad91ed56c1c1c' 
  AND token = 'GB8dShbCVDd70cE73rSaYwlNIxPVLl2isBXW9ZuUO3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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