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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77a79c241d3362f514473576f6892b5a57a3ad5ae841814e1ea8d6b70a40733f' 
  AND token = 'DMf8I3IUjXA56M6DeBIY1fRFWD/gSx60a0eyGCNyrdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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