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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54bbbd811d4448a8054d1be3d969a413409152adf10b4fa81b7ba2543e4ad8b' 
  AND token = '78+FyRwNEFhR0GcW1Isji47QG21mVnvE6eL0EcI5OSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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